JPH0650267Y2 - Structure of the attachment part of the bag in the airbag device - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention is an airbag that is inflated by gas from a gas generator that operates when a vehicle crashes and absorbs the impact of a seated occupant to protect it. The present invention relates to a structure for attaching a bag body in an apparatus.

[Conventional technology]

BACKGROUND ART Conventionally, a bag body of an airbag device of this type has two circular woven cloths coated with rubber or synthetic resin sewn on the outer edge portions thereof so as to withstand the maximum internal pressure at the time of expansion and deployment, and one woven cloth The one with a mounting hole for mounting a gas generator is used.

The bag body is provided with a plurality of mounting holes in the peripheral portion of the mounting port, and bolts or rivets are fastened to the mounting holes and fastened to the mounting bracket of the gas generator by fastening. There is.

By the way, when the airbag device is inflated, the pressure of the combustion gas and the compression force due to the weight of the occupant suddenly act, so that the attachment portion of the bag body needs to have a considerable attachment strength.

Therefore, conventionally, as described in Japanese Utility Model Publication No. 57-56923, a reinforcing cloth formed by laminating a glass fiber woven cloth and rubber is provided on the peripheral portion of the bag mounting opening, and the reinforcing cloth is used as the bag body. It is provided that the inner periphery and the outer periphery of the attachment port are fixed to each other with different lengths.

In Japanese Utility Model Laid-Open No. 63-34751, there is provided a suture reinforcing coat layer having a cured adhesive layer as a reinforcing cloth.

Further, in JP-B-57-60166, the inner peripheral edge of the peripheral edge of the bag attachment port is made smaller in diameter than the outer peripheral edge of the gas generator, and the outer peripheral edge of the gas generator is radially arranged on the inner peripheral edge. There is provided one having a slit cut to a position substantially equal to or higher than the peripheral portion.

Furthermore, in Japanese Utility Model Laid-Open No. 61-185642, the peripheral portion of the bag attachment opening is extended radially inward from the inner diameter surface of the fixed ring by a required width, and the inner diameter of the fixed ring is extended to this extended portion. Chain stitches are provided by chain stitch sewing machine along the entire surface.

[Problems to be solved by the device]

The one described in Japanese Utility Model Publication No. 57-56923 has a drawback that it takes time and effort to manufacture a reinforcing cloth in which a glass fiber woven cloth and rubber having different lengths are laminated, and the cost also increases. It was

Further, in the one disclosed in Japanese Utility Model Publication No. 63-34751, it takes time and effort to manufacture because the reinforcing cloth has to be coated with an adhesive and adhered to the peripheral portion of the bag attachment opening before sewing. At the same time, it has a drawback that the cost becomes large.

Further, in the one disclosed in Japanese Patent Publication No. 57-60166, the distance from the bolt mounting hole to the inner peripheral edge of the peripheral portion of the bag mounting opening can be made larger than before, so that a slight increase in strength can be expected. Since the structure described in this publication does not have the reinforcing cloth, the strength of the mounting portion cannot be satisfied only by the woven cloth of the bag body. This is because as long as it is a woven fabric, the woven yarn is cut short in a certain direction, and this portion does not increase the strength so much. Further, in this case, the diameter of the inner peripheral edge of the peripheral edge of the bag attachment port is not so large as to block the gas ejection port of the gas generator, and therefore the strength is not significantly increased due to the constraint condition from this aspect. It had the drawback of not being able to bite.

Furthermore, in the one disclosed in Japanese Utility Model Laid-Open No. 61-185642, only the chain stitch provided on the peripheral portion of the bag attachment opening of one base cloth is a specific direction in which the base cloth is a woven fabric. Is weaker than other directions, and under conditions where the distance from the mounting holes such as bolts to the mounting port is small, such as at the peripheral edge of the bag mounting port, when the airbag expands suddenly in the radial direction. However, there is a concern that the peripheral portion of the bag attachment opening may break from the attachment hole and gas may leak, impeding the occupant protection function of the airbag device.

The present invention has been made in view of the above problems of the prior art, and an object thereof is to reliably protect an occupant without breaking the peripheral portion of the bag attachment opening. It is an object of the present invention to provide a structure for attaching a bag body in an airbag device that can be manufactured and is easy and inexpensive to manufacture.

[Means for Solving the Problems]

In order to achieve the above object, the structure for attaching the bag body in the airbag device according to the present invention is designed so that the texture of the peripheral portion of the bag attachment opening and the texture of the reinforcing cloth are not aligned in the same direction. It is characterized in that the reinforcing cloth is sewn to the peripheral portion of the bag attachment opening so that the weave has an angle difference.

Further, the reinforcing cloth is sewn in an annular shape at least in the vicinity of the attachment opening at the peripheral portion of the bag attachment opening.

Further, it is characterized in that an inner peripheral edge of the peripheral edge portion, which is at the shortest distance from the attachment hole formed in the peripheral edge portion of the bag body attachment opening, is extended inward in the radial direction.

Furthermore, the peripheral edge of the bag attachment port and the reinforcing cloth are sewn in a double loop with a suture thread, and the first suture thread and the second suture thread are staggered. Characterized by overlapping and sewn.

〔Example〕

 Examples will be described with reference to the drawings.

1 is a sectional view of an airbag device according to the present invention in an inflated and deployed state, FIG. 2 is an exploded perspective view of essential parts, FIG. 3 and FIG.
FIG. 5 is a plan view of the peripheral portion of the bag attachment opening, and FIG. 5 is a plan view showing the weave structure of the base material.

Reference numeral 10 denotes a bag body formed by sewing the outer edges of two circular base materials 11 and 12 with a suture thread 13. As shown in FIG. 1, it is preferable that the outer edge portion is sewn so that at least a double circle is formed at the sewn portion by the suture thread 13 for reinforcement. These base materials 11 and 12 are made of a flexible and airtight material obtained by coating synthetic fiber woven cloth with heat resistant rubber or synthetic resin, and the coated surface is the inner surface of the bag body 10. It is arranged to.

An attachment port 14 for inserting a gas generator 24, which will be described later, is provided in the central portion of the base material 11. The peripheral portion 15 of this mounting opening 14
The inner and outer surfaces are reinforced by superposing annular reinforcing cloths 16 and 17 made of the same material as the base materials 11 and 12 on each other and stitching them with a suture thread 13 to integrate them. In order to sew the reinforcing cloths 16 and 17 to the peripheral edge portion 15, both the textures have an angle difference so that the textures of the peripheral edge portion 15 and the reinforcing cloths 16 and 17 are not aligned in the same direction. To sew. This is because in a woven fabric, one specific direction is weaker than the other direction, so that by providing an angle difference between the texture of the peripheral edge portion 15 and the texture of the reinforcing cloths 16 and 17, it is possible to perform To increase the strength. So, for example,
If the weave of the reinforcing cloth 16 has an angle difference of 30 degrees from the weave of the peripheral edge portion 15 and the stitch of the reinforcing cloth 17 has an angle difference of 60 degrees from the weave of the peripheral edge portion 15 Good. Reinforcing cloth
If only one of 16 and 17 is sewn,
Sewn so that the weave of 5 and the weave of the reinforcing cloth have an angle difference of 45 degrees. In addition, the reinforcing cloths 16 and 17 are
A suture thread 13 is sewn in an annular shape at least in the vicinity of the attachment port 14 and sewn. By doing so, the annular seam can be prevented from being displaced outward in the radial direction acting on the peripheral edge portion 15 when the airbag is inflated and deployed by abutting against the fixing ring 21 described later. Then, the peripheral portion 15 and the reinforcing cloths 16, 1
In order to increase the strength, the suture 13 is sewn in a double loop with the suture thread 13, and the first suture thread 13 and the second suture thread 13 are overlapped in a zigzag manner. Good to sew. In addition, as shown in FIG.
May be sewn so that at least a triple circle is formed in the sewn portion.

At the periphery 15 of the mounting opening 14 of the bag body 10, bolts 18 and rivets
A plurality of mounting holes 11a, 11a ... Are bored in order to insert 19 through. When the inner peripheral edge of the peripheral edge portion 15 which is the shortest distance from these mounting holes 11a, 11a ...
The distance from 11a to the mounting port 14 becomes long, and the breaking strength can be increased. For that purpose, for example, tongue-shaped extending portions 20a, 20a ... May be projected as shown in FIG. 3, and triangular extending portions 20b, 20 may be formed as shown in FIG.
b ... may be projected, and the extension shape does not matter.

Attachment holes 16a, 16a ..., Attachment holes 17a, 17a ... Are drilled at positions corresponding to the attachment holes 11a, 11a. Then, these peripheral portion 15 and the reinforcing cloth 1
6, 17 are sandwiched between the fixing ring 21 and the holding metal fitting 22, for example, the mounting holes 11a, 11a ..., Mounting holes 16a, 16a.
..., bolts 18, 18 ... are inserted into the mounting holes 17a, 17a ... at four points respectively, and tightened with nuts 23, 23 ..., so that the gas generator 24 is hermetically coupled. The remaining mounting holes 11
The rivets 19, 19 ... Are inserted and fastened to the a, 11a, the mounting holes 16a, 16a, and the mounting holes 17a, 17a. The airbag is attached to the center of a steering wheel (not shown) in a folded state.

The gas generator 24 is in the shape of a thin cylindrical container in which a gas generating agent is enclosed, and a plurality of gas ejection ports 25, 25 are provided on the side surface thereof at appropriate intervals along the circumferential direction. Are formed. Then, the gas generated by detonating the gas generating agent is supplied to the gas generator 2 from the jet ports 25, 25 ...
It is designed to eject in a direction orthogonal to the axis of 4.
Further, a flange 26 is provided on the outer periphery of the gas generator 24 at the side of the gas ejection ports 25, 25 ... And the holding metal fitting 22 is attached to this flange 26.

A protective sheet (not shown) may be provided inside the bag 10 of the reinforcing cloth 16 in order to increase the strength of the bag 10 by the gas ejected from the gas generator 24.

[Action]

When a vehicle collision or the like occurs, a gas generating agent in the gas generator 24 is detonated by a sensor (not shown) to generate gas. The generated gas is discharged from the gas outlet 24, 25 ...
Ejects in a direction orthogonal to the axis of. Then, the air bag is supplied into the air bag through the peripheral portion 15 of the mounting opening 14 of the bag body 10, and the air bag is inflated and deployed as shown in FIG.

At this time, a high stress is generated outward in the radial direction on the peripheral edge portion 15, but the peripheral edge portion 15 is reinforced by sewing the reinforcing cloths 16 and 17, and the texture of the peripheral edge portion 15 is Reinforcing cloth 16,17
Since both weaves are sewn so that there is an angle difference so that they do not line up in the same direction, the strength is guaranteed in all directions, and there is a risk of breakage at the peripheral edge portion 15. Absent. Further, the reinforcing cloths 16 and 17 are sewn to the peripheral edge portion 15 in an annular shape at least in the vicinity of the mounting opening 14, and the annular seam abuts on the fixing ring 21 to outwardly act in the radial direction acting on the peripheral edge portion 15. It is possible to prevent the deviation. Further, since the peripheral portion 15 and the reinforcing cloths 16 and 17 are sewn by double stitching and are sewn in a zigzag manner, the reliability of strength is further maintained. Further, since the inner peripheral edge of the peripheral edge portion 15 which is the shortest distance from the mounting holes 11a, 11a ... Is extended inward in the radial direction, and the distance from the mounting hole 11a to the mounting port 14 is increased, The breaking strength is further increased. Therefore, there is no risk of gas leakage.

[Effect of device]

Since the present invention is configured as described above and the mounting portion of the bag body is reinforced, the bag mounting portion is not broken and the occupant can be reliably protected.

Moreover, since it is only necessary to sew the same material as the airbag base fabric without using a special material, the manufacturing is easy,
And it can be provided at low cost.

[Brief description of drawings]

1 is a sectional view of an airbag device according to the present invention in an inflated and deployed state, FIG. 2 is an exploded perspective view of essential parts, FIG. 3 and FIG.
FIG. 5 is a plan view of the peripheral portion of the bag attachment opening, and FIG. 5 is a plan view showing the weave structure of the base material. 10 ... Bag, 11a ... Mounting hole, 13 ... Suture, 14 ... Mounting port, 15 ... Peripheral part, 16,17 ... Auxiliary cloth, 20a, 20b ... Extended part,

Claims (4)

[Scope of utility model registration request] 1. The reinforcing cloth is provided along the peripheral edge of the bag attachment opening so that the texture of the peripheral edge of the bag attachment opening and the texture of the reinforcing cloth are not aligned in the same direction so that the two textures have an angle difference. A structure for attaching a bag body in an airbag device, which is sewn to a portion. 2. A structure for attaching a bag body in an airbag device according to claim 1, wherein a reinforcing cloth is sewn in a peripheral portion of the bag body attachment opening in a ring shape at least in the vicinity of the attachment opening. 3. The inner peripheral edge of the peripheral portion, which is at the shortest distance from the mounting hole formed in the peripheral portion of the bag mounting opening, extends inward in the radial direction. A structure for attaching a bag body in the airbag device according to 2. 4. A peripheral portion of a bag attachment opening and a reinforcing cloth are sewn by sewing a suture thread in a double loop, and the first suture thread and the second suture thread are staggered. 4. The structure for attaching a bag body in an airbag device according to claim 2 or 3, wherein the bag portion is sewn in an overlapping manner.